ecofort Gtech Pro Manuel D'utilisation page 14

If the suction is low when the bag is empty and a new bag is
fitted you have a blockage.
Remove the battery and lid and look
through the nozzle. Remove any blockages.
The tools can block too, sometimes.
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Remove the bag from the lid.
Check for any blockages in the lid.
Remove any blockages.
A light above the window on the top of the
lid allows visibility into the bag to indicate
when the bag is full or if there is a blockage.